It is narrated from Sayyiduna Anas bin Malik (may Allah be pleased with him) that Sayyiduna Thabit bin Qays (may Allah be pleased with him) came on the day of al-Yamamah, having applied embalming perfume and spread out his shrouds, and said: "O Allah, I declare myself free before You of what these people have brought, and I offer apology for what these people have done." Then he was martyred. He had a coat of mail which was stolen. A man saw him in a dream, and Thabit (may Allah be pleased with him) said: "My coat of mail is in a cooking pot beneath the stove in such-and-such a place," and he gave him some instructions for his will. So the people searched for the coat of mail and found it there, and they carried out his instructions.
Hadith Referenceالمعجم الكبير للطبراني / باب الثاء / 1294